build: add dev startup scripts and project docs

添加了Windows的start.bat和Linux/macOS的start.sh一键启动脚本，补充了完整的项目README文档，同时修复了前端类型文件的导入路径问题

start.sh

@@ -0,0 +1,91 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# ═══════════════════════════════════════════
+#  姜十三论坛 开发环境启动脚本 (Linux/macOS)
+# ═══════════════════════════════════════════
+
+ROOT_DIR="$(cd "$(dirname "$0")" && pwd)"
+cd "$ROOT_DIR"
+
+echo "══════════════════════════════════════════"
+echo "  姜十三论坛 开发环境启动脚本"
+echo "══════════════════════════════════════════"
+echo ""
+
+# ---- 1. 启动 PostgreSQL ----
+echo "[1/3] 启动数据库 (Docker Compose)..."
+if ! command -v docker &>/dev/null; then
+    echo "✗ 未检测到 docker，请先安装 Docker"
+    exit 1
+fi
+docker compose up -d postgres
+echo "√ 数据库已启动"
+echo ""
+
+# ---- 2. 检查后端配置 ----
+echo "[2/3] 检查后端配置..."
+if [ ! -f "backend/app.ini" ]; then
+    cp "backend/app.ini.example" "backend/app.ini"
+    echo "  已从模板创建 backend/app.ini，请按需修改配置"
+fi
+mkdir -p backend/data
+
+# 启动后端（后台）
+echo "  启动后端 (端口 3001)..."
+cd "$ROOT_DIR/backend"
+go run ./cmd/jiang13 &
+BACKEND_PID=$!
+cd "$ROOT_DIR"
+echo "√ 后端已启动 (PID: $BACKEND_PID)"
+echo ""
+
+# ---- 3. 检查前端配置 ----
+echo "[3/3] 检查前端配置..."
+if [ ! -f "frontend/.env.local" ]; then
+    cp "frontend/.env.example" "frontend/.env.local"
+    echo "  已从模板创建 frontend/.env.local"
+fi
+
+# 检查 node_modules
+if [ ! -d "frontend/node_modules" ]; then
+    echo "  首次运行，安装前端依赖..."
+    cd "$ROOT_DIR/frontend"
+    npm install
+    cd "$ROOT_DIR"
+fi
+
+# 启动前端（后台）
+echo "  启动前端 (端口 3000)..."
+cd "$ROOT_DIR/frontend"
+npm run dev &
+FRONTEND_PID=$!
+cd "$ROOT_DIR"
+echo "√ 前端已启动 (PID: $FRONTEND_PID)"
+echo ""
+
+echo "══════════════════════════════════════════"
+echo "  全部启动完成！"
+echo ""
+echo "  前端:  http://localhost:3000"
+echo "  后端:  http://localhost:3001"
+echo "  数据库: localhost:5432"
+echo ""
+echo "  后端 PID: $BACKEND_PID"
+echo "  前端 PID: $FRONTEND_PID"
+echo "  停止服务: kill $BACKEND_PID $FRONTEND_PID && docker compose down"
+echo "══════════════════════════════════════════"
+
+# 捕获 Ctrl+C，清理子进程
+cleanup() {
+    echo ""
+    echo "正在停止服务..."
+    kill $BACKEND_PID 2>/dev/null || true
+    kill $FRONTEND_PID 2>/dev/null || true
+    docker compose down 2>/dev/null || true
+    echo "已停止"
+}
+trap cleanup EXIT INT TERM
+
+# 保持脚本运行
+wait